Gear.



H. L. HUDSON.

GEAR.

APPLICATION FILED JULY 20,1911.

g gm A Patented @013. 29, 1912.

HES

I-IMlRBISQIN HUD$O1\=', (3F CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO WILLIAM LUTI-IAEDT, OF CHICAGO, ILLINOIS. I l

GEAR.

Specification of Letters Patent.

Putontodflcin2%,119112.

Sontinuation or? application Serial No. 6173958, filed March 30, 1911. This application filed July 20, 1911.

Serial No. 639,560.

To oil whom it may concern:

Be it known. that l, Hunnrsox L. Henson, u citizen of the United States, residing at Chicago, in the county of Cool: and State of l ll jshape.

I will ekpuun my invention more i'ully lllinois, have invented s. certain new and useful ln'iproyenient in Gears, of which the 'hillowing is e full, clear, concise, and exact description, rei'e en'ce being had to the oc- -i-oiu1. un ,'ino; drawings, forming a part of this iecil'ii-ntion.

. intention relates to power transmission 910:1 rs or" that class in. which the toothed portions are separated flOllfllJUt' are movable with respect to the body portions and the 1n- Ycntion is of purticulur service where sound insulating cushioning material. is interposed between lhe toothed and body members of the ecu-rs to reduce or eliminate the-noise due to no r operation.

Gears or this character, as hitherto constructed, ore open to the objection that the toothed rings of the gears Were capable movement circuin'ilereutislly oi undesirubio with respect to the body portions of the goers upon sulliclent cluinge of the loud to which the gear teeth were subject. By incui' s of my invention such undesirable circumferential movement. is guarded against, wliereby the non-integral toothed ring and body portion of each gear may perform their functions substantially as though they were integrally formed, while at the some time the lTOOi'llOfl ring is udspized to yield when encountering an unusual strain. 1

In the preferred en'ibodinient of the invention, a guiding structure is royided which is made up of elements incnded in the formation of the toothed ring; and body portion oi the gear, whereby tlwe two gear ports are interlocked or interengoged in such :1 inunner us to prevent undesirable circunir i'iereruiol movementv between 'tllfieiQlJlVO gear ports. The. toothed ring of the gear is llexiblo so that it may be forced out of its true shape when encountering unusual loud,

end is resilient so that it may automatically,

resume its true shape when the undue load is removed, the guiding means which I pro.

vide determining the direction in which the toothed ring n1. uy flex when-subycct to undue loud and may return when resumlng normal by reference to the accompanying drawing embodied in an externally toothed put oe r, though it is to be understood that I do not limit myself to u spur. gear, nor to a gear that is externally toothed.

In the drawing Figure 1 is 3 side elevo- Lion of uv spur gear embodying, the inventiou; l ig. is a. sectional View on line 2 2 of Fig. 1-; and Fig. is :1 yiew of the body portion of the spur gear unussociaied with the toothed ring but, having one form of cushion in place.

Like parts are indicoled by similar characters. of reference throughout the different figures In the en'lbodiinent of the invention illustruted,'the body portion 1. of the gear is surrounded by :1 ring; 2 which is provided with gear teeth 3 upon its outer periphery. The ring 2 ficxibleso that it may be forced out of its true circular shape and is resilient so that-it may automatically resume its proper shape. The cushion is interposedbetueen the body 1 and the ring 2, this cushion acting as :1 sound rleulilenlug or insulating element and being resilient to fill the changeable clearance between the elements 1 and 2. The cushion will yield to permit the toothed ring to more with re spect to the axis ofrotutin of the body member 1 and transversely of such uxi's,tho

clearance-between the members it and 2. of

the gear being prefe 'ubly just suflicient to permit the gear teeth of another gear that mesh with. the gear teeth 3 to have their outer edges reach the pitch circleof the gee;

teeth 3, by which srrangenieiu' the gears will not become unnieshed although the toothed ring 2 1s pernntted to move away from the gei r' with which it is in mesh, when the teeth 3 encounter unusual opposition. The resilient cushion l is shown us being made 'inthe'iorm of u rubbegj band, but I do notf liinil: myself to an annular cushion. In ordcr to prevent undesirable circumieronliul nim'enient oi the members 1 and 2 with respect to each other, I plOYld. u. our-structure which preferably includes, H! the (use all disposed fingers 5 in lixcd rclutioh with the ring 2 and which are received within rzu'liully disposed grooves 6 in the body portion 1 of the gear. Clearance normally in tervenes between the inner ends of the.

grooves 6 and the inner ends of the radial fingers 5, wlnch clearance is preferably not clearance at the inner ends of the fingers permitting said fingers to slide toward the axis of rotation of the gear as these fingers become interposed between the place of un-' usual pressure upon the teeth 3jand the shaft 7 upon which the body portion of the gear is keyed. The toothed ring being sufiici'ently flexible, the portion thereof that is immediately subject to unusual pressure or load is moved toward the body of the gear without accompanying undesirable circumferential motion owing to the guide structure which I have provided. When the unusual load has been removed the ring will autoinatically resume its proper shape due to its resiliency. Separation of the members 1 and 2 of the gear longitudinally of the axis of rotation of the gear is prevented by means of pins 8 which are provided with heads that engage the fingers 5 on one face of the gear andthe body portion 1 upon the other face of the gear, the shanks of the pins 7 passing through recesses 9 that are of sufficient size to permit the pins 8 to move therein as the fingers 5 slide with reference to the gear body'l. By the construction illustrated, movement between the members of .the gear is substantially confined to radii extending from the center of the body portion of the gear, which center, in the embodiment of the invention shown, lies within the axis of the shaft- 7. There is thus provided a certain fixed relationship between the shaft and the toothed ring 2 which will prevent undesirable circumferential movement between said shaft and ring, a result which is highly to be desired in the transmission of power.

Having thus described my invention, I claim as new and desire to secure by Letters Patent the following 1. A gear including spaced apart toothed and bodymembers; a body of sound deadening material between said members and permitting movement bet-ween said members; and a guide structure having complemental portions that are provided upon said members,'and which guide structure serves to define relative movement between said members transversely of the axis of rotation, the toothed member of the ear being of ring like formation and sufiiclently flexible I to permit it to be moved withlrespect to the body member of the gear at the part where unusual load is encountered and being-sufficiently resilient to permit it to resume its proper shape when the undue load is removed.

2. A gear including 5 aced apart toothed and body. members; and having complemental portions that are provided upon said members, and which guide structure serves to define relative movement between said members transversely of the axis of rotation, the toothed member of the gear being of ring like formation and sufficiently flexible to permit it to be moved with respect to the body member of the gear at the part where unusual load is encountered and being sufficiently resilient to permit it to resume its proper shape when the undue load is removed.

3. A gear including spaced apart toothed and body portions that are relatively movable transversely of the axis of rotation; a body of sound deadening material between said portions and permitting movement be tween said portions; and a guide structure having complemental portions that are provided upon said gear portions, and wiich' guide structure serves to define the relative movement between said gear portions transversely of the axis. of rotation.

.41. A gear including spaced apart toothed and body portions that are relatively movable transversely of the axis of rotation; and a guide structure having complemental portions that are-provided upon said gear por tions, and which guide structure serves to define the relative movement between said gear portions transversely of the axis of rotation.

In witness whereof, I hereunto subscribe my name this 13th day of July A; D., 1911.

HARRISON L. HUDSON.

Witnesses:

E. L. WHITE, G. L. CRAGG.

a guide structure 

